[PATCH] gdb: Fix "info os <unknown>" command

[Simon Marchi]

On 2018-12-21 12:31 p.m., Tom Tromey wrote:
>>>>>> "Paul" == Paul Marechal <paul.marechal@ericsson.com> writes:
> 
> Paul> Running `info os someUnknownOsType` is crashing when gdb is built with
> Paul> -D_GLIBCXX_DEBUG:
> 
> Paul> 	/usr/include/c++/5/debug/vector:439:error: attempt to
> Paul> 	access an element in
> Paul> 	    an empty container.
> 
> Thank you for the patch.
> Someday I hope to send a patch to enable -D_GLIBCXX_DEBUG by default
> when building gdb in not-release mode.

Yep, that would be nice!

> Paul> This is a regression in gdb 8.2 and this patch restores the behavior of
> Paul> previous versions.
> 
> Perhaps it isn't too late to put this on the 8.2 branch, as it seems
> simple enough.

Yes, it's on the 8.2.1 list:

https://sourceware.org/ml/gdb-patches/2018-12/msg00167.html

> Paul> 	PR gdb/23974
> Paul> 	* target.c (target_read_stralloc): Check for empty vector.
> 
> Paul> gdb/testsuite/ChangeLog:
> 
> Paul> 	PR gdb/23974
> Paul> 	* gdb.base/info-os.exp: Check return for unknown "info os" type.
> 
> This is ok.

Thanks for looking at it, I'll push it right now (on master and 8.2) on Paul's behalf.

Simon